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EMVCAPcore.py
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EMVCAPcore.py
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# coding: latin-1
from Crypto.Cipher import DES
# Copyright 2011, 2012
# Philippe Teuwen <[email protected]>
# Jean-Pierre Szikora <[email protected]>
# Cette crŽation est mise ˆ disposition selon
# le Contrat Attribution-NoDerivs 2.0 Belgium
# disponible en ligne http://creativecommons.org/licenses/by-nd/2.0/be/
# ou par courrier postal ˆ Creative Commons, 171 Second Street,
# Suite 300, San Francisco, California 94105, USA.
# Little conversion fcts
# APDUs will be either hex strings or lists of integers
def hex2lint(hex):
return [i for i in bytes.fromhex(hex)]
def lint2hex(lint):
return ''.join(["%02X" % i for i in lint])
def lint2ascii(lint):
return ''.join([chr(i) for i in lint])
ApplicationsList = [
# From attempts by a Fortis Vasco810 when presenting e.g. an empty JCOP:
{'name':'VisaRemAuthen',
'description':'VisaRemAuthen = VISA DEP ~ CAP',
'AID':'A0000000038002',
'onVasco810?':True,
'mode':'DPA'},
{'name':'SecureCode Aut',
'description':'SecureCode Aut = MasterCard CAP',
'AID':'A0000000048002',
'onVasco810?':True,
'mode':'CAP'},
{'name':'BANCONTACT',
'description':'BANCONTACT',
'AID':'D056000666111010',
'onVasco810?':True,
'mode':'BANCONTACT'},
{'name':'VISA electron',
'description':'VISA Electron (Debit)',
'AID':'A0000000032010',
'onVasco810?':True,
'mode':'VISA'},
{'name':'VISA credit',
'description':'Standard VISA credit card',
'AID':'A0000000031010',
'onVasco810?':True,
'mode':'VISA'},
{'name':'MasterCard credit',
'description':'MasterCard credit (or debit?)',
'AID':'A0000000041010',
'onVasco810?':True,
'mode':'MC'},
{'name':'MAESTRO',
'description':'MAESTRO',
'AID':'A0000000043060',
'onVasco810?':True,
'mode':'MAESTRO'},
# Other sources of AID:
# http://globalblindspot.blogspot.com/2010/06/emvcap-application-ids.html
# https://spreadsheets.google.com/pub?\
# key=0Aulc2eB5eBHZdDRIU0Zva2U2NWY4N0ppNFFrN3hEVVE
{'name':'VISA V-PAY?',
'description':'VISA V-PAY?',
'AID':'A0000000032020', 'onVasco810?':False},
{'name':'VISA Interlink',
'description':'VISA Interlink',
'AID':'A0000000033010', 'onVasco810?':False},
{'name':'VISA Specific(1)',
'description':'VISA Specific(1)',
'AID':'A0000000034010', 'onVasco810?':False},
{'name':'VISA Specific(2)',
'description':'VISA Specific(2)',
'AID':'A0000000035010', 'onVasco810?':False},
{'name':'VISA Plus',
'description':'VISA Plus',
'AID':'A0000000038010', 'onVasco810?':False},
{'name':'MasterCard unknown1',
'description':'MasterCard unknown1',
'AID':'A00000000410101213', 'onVasco810?':False},
{'name':'MasterCard unknown2',
'description':'MasterCard unknown2',
'AID':'A00000000410101215', 'onVasco810?':False},
{'name':'MasterCard Specific3',
'description':'MasterCard Specific3',
'AID':'A0000000042010', 'onVasco810?':False},
{'name':'MasterCard Specific4',
'description':'MasterCard Specific4',
'AID':'A0000000043010', 'onVasco810?':False},
{'name':'MasterCard Specific5',
'description':'MasterCard Specific5',
'AID':'A0000000044010', 'onVasco810?':False},
{'name':'MasterCard Specific6',
'description':'MasterCard Specific6',
'AID':'A0000000045010', 'onVasco810?':False},
{'name':'MasterCard Cirrus',
'description':'MasterCard Cirrus (interbank network)',
'AID':'A0000000046000', 'onVasco810?':False},
{'name':'UK Maestro',
'description':'UK Domestic Maestro - Switch (debit card)',
'AID':'A0000000050001', 'onVasco810?':False},
{'name':'UK Maestro Solo',
'description':'UK Domestic Maestro - Switch (debit card) Solo',
'AID':'A0000000050001', 'onVasco810?':False},
{'name':'American Express',
'description':'American Express credit/debit',
'AID':'A0000000250000', 'onVasco810?':False},
{'name':'American Express 2',
'description':'American Express 2',
'AID':'A00000002501', 'onVasco810?':False},
{'name':'ATM cardLINK',
'description':'ATM cardLINK (UK) ATM network',
'AID':'A0000000291010', 'onVasco810?':False},
{'name':'Consorzio BANCOMAT',
'description':'Consorzio BANCOMAT Pagobancomat Italian ' +\
'domestic debit card',
'AID':'A0000001410001', 'onVasco810?':False},
{'name':'SAMA',
'description':'SAMA Saudi Arabia domestic credit/debit card ' +\
'(Saudi Arabia Monetary Agency)',
'AID':'A0000002281010', 'onVasco810?':False},
{'name':'INTERAC',
'description':'INTERAC Canadian domestic credit/debit card',
'AID':'A0000002771010', 'onVasco810?':False},
{'name':'ZKAGirocard', 'description':'ZKAGirocard',
'AID':'A0000003591010028001', 'onVasco810?':False},
# French CB
{'name':'Carte Bleue', 'description':'Carte Bleue',
'AID':'A0000000421010', 'onVasco810?':False},
# From emv-cards_and_internet_banking_-_michael_schouwenaar.pdf
# special selects on few files?
# BCA4000002 2901 (?)
# BCA4000002 2F00 (?)
# BCA4000002 2FFD (?)
]
class TLV():
def __init__(self, T, L, V=None):
self.T = T
self.L = L
if T > 0x100:
T1 = T >> 8
self.hex_T = "%04X" % T
else:
T1 = T
self.hex_T = "%02X" % T
self.tclass = T1 >> 6
self.type = (T1 & 0x20) >> 5
self.known_in_dol = False
if T in TLVdict:
self.name = TLVdict[T]['name']
if 'known_in_dol' in TLVdict[T]:
self.known_in_dol = TLVdict[T]['known_in_dol']
else:
self.name = 'Unknown tag %0X' % T
if V is None:
self.V = None
else:
if V == [] or isinstance(V[0], TLV): # already parsed
self.V = V
else:
if T in TLVdict and 'onlyTL' in TLVdict[T]:
self.V = TLVparser(V, False)
else:
if self.type == 0x01: # constructed
self.V = TLVparser(V)
else:
self.V = lint2hex(V)
if T in TLVdict and 'parse' in TLVdict[T]:
self.prettyV = TLVdict[T]['parse'](V)
def __len__(self):
return self.L
def __cmp__(self, tlv2):
if isinstance(tlv2, int):
return tlv2 == self.T
elif isinstance(tlv2, str):
return tlv2 == self.name
else:
raise 'Comparison only with T as int or with name, sorry'
def __iter__(self):
return self.V.__iter__()
def get(self, name, multi=False):
l = [v for v in self.V if v == name]
if multi: # return list of matching tlvs, empty list if none found
return l
else:
if len(l) > 0:
return l[0]
else:
return None
def __eq__(self, tlv2):
return self.__cmp__(tlv2)
def __repr__(self):
r = "<TLV\n"
r += " Tag: %02X (%s)\n" % (self.T, self.name)
classnames = ['universal', 'application',
'context specific', 'private']
r += " %s class\n" % classnames[self.tclass]
typenames = ['primitive', 'constructed']
r += " %s\n" % typenames[self.type]
r += " Length: %i bytes\n" % self.L
r += " Value: "
if isinstance(self.V, list):
r += '\n %s\n' % repr(self.V).replace('\n', '\n ')
else:
r += "%s\n" % self.V
if hasattr(self, 'prettyV'):
r += " == %s\n" % self.prettyV
r += ">"
return r
def TLVparser(raw, hasdata=True):
if len(raw) == 0:
return False
# EMV 2000 only supports tagnames of length 1 or 2 (from book, ch4.2)
# should we support tagnames of lengths > 2?
if raw[0] & 0x1F == 0x1F:
T = (raw[0] << 8) + raw[1]
raw = raw[2:]
else:
T = raw[0]
raw = raw[1:]
if raw[0] < 128:
L = raw[0]
raw = raw[1:]
else:
LL = raw[0] & 0x7F
if LL == 1:
L = raw[1]
raw = raw[2:]
elif LL == 2:
L = (raw[1] << 8) + raw[2]
raw = raw[3:]
else:
# length > 65535??? then it's probably still a 1-byte length
return False
if not hasdata:
V = None
# raw = raw
else:
V = raw[:L]
raw = raw[L:]
resp = [TLV(T, L, V)]
if len(raw) > 0:
resp.extend(TLVparser(raw, hasdata))
return resp
def reconstruct(ct, template):
assert 0x80 in ct
data = ct[ct.index(0x80)].V
offset = 0
tlv77length = 0
tlv77data = []
for (tag, length) in template:
if length >= 0:
x = hex2lint(data[offset:offset + (2 * length)])
offset += 2 * length
else:
# Length -1 in our template means all remaining data
x = hex2lint(data[offset:])
tlv_x = TLV(tag, len(x), x)
tlv77data.append(tlv_x)
tlv77length += len(tlv_x)
return [TLV(0x77, tlv77length, tlv77data)]
template_processingoptions = \
[(0x82, 2), (0x94, -1)]
template_generatearqc = \
[(0x9f27, 1), (0x9f36, 2), (0x9f26, 8), (0x9f10, -1)]
# If more EMV tags are needed, some sources are:
# * http://cheef.ru/docs/HowTo/TAG.info
# * http://www.emvlab.org/emvtags/all/
# * https://cardpeek.googlecode.com/svn-history/trunk/dot_cardpeek_dir\
# /scripts/emv.lua
TLVdict = {
0x42: {'name': 'issuer authority',
'parse': lint2ascii},
0x4F: {'name': 'AID', },
0x50: {'name': 'Application Label',
'parse': lint2ascii},
0x57: {'name': 'track2 equivalent data', },
0x5A: {'name': 'application Primary Account Number (PAN)', },
0x5F20: {'name': 'Cardholder Name',
'parse': lint2ascii},
0x5F24: {'name': 'application expiration date',
'parse':
lambda x: 'YY=%02X MM=%02X DD=%02X' % (x[0], x[1], x[2])},
0x5F25: {'name': 'application effective date',
'parse':
lambda x: 'YY=%02X MM=%02X DD=%02X' % (x[0], x[1], x[2])},
0x5F28: {'name': 'issuer country code', },
0x5F30: {'name': 'Service Code', },
0x5F2A: {'name': 'Transaction Currency Code',
'known_in_dol': True},
0x5F2C: {'name': 'Cardholder nationality', },
0x5F2D: {'name': 'language preference',
'parse': lint2ascii},
0x5F34: {'name': 'application PAN sequence number', },
0x5F55: {'name': 'Issuer Country Code (alpha2 format)',
'parse': lint2ascii},
0x61: {'name': 'Application Template'},
0x6F: {'name': 'fci template', },
0x70: {'name': 'aef data template', },
0x77: {'name': 'response message template format 2', },
0x80: {'name': 'Command Template', },
0x82: {'name': 'application interchange profile (AIP)', },
0x83: {'name': 'Command Template', },
0x84: {'name': 'dedicated file (df) name', },
# can be bin (AID) or ascii...
# 'parse': lint2ascii},
0x87: {'name': 'Application Priority Indicator', },
0x88: {'name': 'Short File Identifier (SFI)', },
0x8A: {'name': 'Authorization Response Code',
'known_in_dol': True},
0x8C: {'name': 'card risk management dol 1 (cdol1)',
'onlyTL': True, },
0x8D: {'name': 'card risk management dol 2 (cdol2)',
'onlyTL': True, },
0x8E: {'name': 'cardholder verification method (CMV) list', },
0x8F: {'name': 'Certification Authority Public Key Index', },
0x90: {'name': 'Issuer Public Key Certificate', },
0x91: {'name': 'issuer authentication data',
'known_in_dol': True},
0x92: {'name': 'Issuer Public Key Remainder', },
0x93: {'name': 'Signed Static Application Data', },
0x94: {'name': 'application file locator', },
0x95: {'name': 'Terminal Verification Results',
'known_in_dol': True},
0x9A: {'name': 'Transaction Date',
'known_in_dol': True},
0x9C: {'name': 'Transaction Type',
'known_in_dol': True},
0x9F02: {'name': 'Authorized Amount (AA)',
'known_in_dol': True},
0x9F03: {'name': 'Other Amount',
'known_in_dol': True},
0x9F07: {'name': 'AUC - Application Usage Control', },
0x9F08: {'name': 'Application Version Number', },
0x9F0D: {'name': 'IAC - Default', },
0x9F0E: {'name': 'IAC - Denial', },
0x9F0F: {'name': 'IAC - Online', },
0x9F10: {'name': 'Issuer Application Data', },
0x9F11: {'name': 'Issuer Code Table Index', },
0x9F12: {'name': 'Application Preferred Name',
'parse': lint2ascii},
0x9F14: {'name': 'Lower Consecutive Offline Limit', },
0x9F15: {'name': 'Merchant Category Code',
'known_in_dol': True},
0x9F17: {'name': 'PIN Retry Counter',
'parse':
lambda x: x[0]},
0x9F1A: {'name': 'Terminal Country Code',
'known_in_dol': True},
0x9F1F: {'name': 'Track 1 Discretionary Data',
'parse': lint2ascii},
0x9F23: {'name': 'Upper Consecutive Offline Limit', },
0x9F26: {'name': 'Application Cryptogram (AC)', },
0x9F27: {'name': 'cryptogram information data', },
0x9F32: {'name': 'Issuer Public Key Exponent', },
0x9F33: {'name': 'Terminal Capabilities',
'known_in_dol': True},
0x9F34: {'name': 'cardholder verification method (cvm) results',
'known_in_dol': True},
0x9F35: {'name': 'terminal type',
'known_in_dol': True,
'known_in_dol': True},
0x9F36: {'name': 'Application Transaction counter (ATC)', },
0x9F37: {'name': 'Unpredictable Number (UN)',
'known_in_dol': True},
0x9F38: {'name': 'processing options dol (pdol)',
'onlyTL': True, },
0x9F40: {'name': 'Additional Terminal Capabilities',
# Indicates the data input and output capabilities of the terminal
# (see Annex A3 in Book 4 [3])
'known_in_dol': True,
},
0x9F42: {'name': 'application currency code', },
0x9F44: {'name': 'application currency exponent',
'parse':
lambda x: ("%i (0." % x[0]) + ("0" * x[0]) + ")"},
0x9F45: {'name': 'Data Authentication Code',
'known_in_dol': True},
0x9F46: {'name': 'ICC Public Key Certificate', },
0x9F47: {'name': 'ICC Public Key Exponent', },
0x9F48: {'name': 'ICC Public Key Remainder', },
0x9F49: {'name': 'DDOL',
'onlyTL': True, },
0x9F4A: {'name': 'SDA Tag List', },
0x9F4C: {'name': 'ICC dynamic number',
'known_in_dol': True},
0x9F4D: {'name': 'Log entry', },
0x9F55: {'name': 'Issuer Authentication Flag', },
0x9F56: {'name': 'Issuer Proprietary Bitmap (IPB)', },
0xA5: {'name': 'fci proprietary template', },
0xBF0C: {'name': 'fci issuer discretionary data', },
0xDF07: {'name': 'unknown tag DF07 (Banksys ID??)',
'parse': lint2ascii},
0xDF40: {'name': 'unknown tag DF40',
'known_in_dol': True},
}
def dol_filling(tlv_dol, mode, country="any", transaction_value=0,
unpredictable_number=0, debug=False):
# From book, ch 8.6.1.2
# Most of them are null for EMV-CAP so we only check if
# there are not some unknown stuff in the template
dol_data = ''
if tlv_dol is None:
return dol_data
for t in tlv_dol.V:
if t.known_in_dol:
data = '00' * t.L
if t == 0x8A:
# Authorization Response Code:
if (mode == 'MAESTRO' or mode == 'BANCONTACT' or \
mode == 'VISA') and country == "BE":
# Z1: Offline declined
data = 'Z1'.encode("ascii").upper()
else:
# Z3: Unable to go online (offline declined)
data = 'Z3'.encode("ascii").upper()
elif t == 0x95:
# Terminal verification results:
if (mode == 'MAESTRO' or mode == 'BANCONTACT' or \
mode == 'VISA') and country == "BE":
# Offline data authentication was not performed
# Merchand forced transaction online
data = '8000000800'
else:
# Offline data authentication was not performed
data = '8000000000'
elif t == 0x9A and (mode == 'DPA' or \
(mode == 'VISA' and not country == "BE")):
data = '010101'
elif t == 0x9F02 and transaction_value != 0:
data = '%%0%ii' % (t.L * 2) % transaction_value
elif t == 0x9F33:
# terminal capabilities
# 20 = Card Data Input Capability
# - IC with contacts
# 80 = CVM Capability
# - Plaintext PIN for offline ICC verification
# 00 = Security Capability
data = '208000'
elif t == 0x9F34:
# cardholder verification method (cvm) results
if mode == 'CAP' or mode == 'DPA':
# 01 = ICC Plain PIN verification
# - Fail cardholder verification if...
# 00 = Always
# 02 = Successful (e.g. for offline PIN)
data = '010002'
else:
# 00 = Fail CVM Processing
# - Fail cardholder verification if CVM is unsucces...
# 00 = Always
# 00 = Unknown (for example, for signature)
data = '000000'
elif t == 0x9F35:
# terminal type
# in [schouwenaar] it's in cdol rather than pdol
if mode == 'CAP' or mode == 'DPA' or \
(mode == 'MAESTRO' and country != 'BE'):
# 3 = operated by cardholder
# 4 = Unattended, online only
data = '34'
else:
# 3 = operated by cardholder
# 7 = ??
data = '37'
elif t == 0x9F37 and unpredictable_number != 0:
data = '%%0%ii' % (t.L * 2) % unpredictable_number
assert len(data) / 2 == t.L
dol_data += data
if debug:
print('Will use %s for tag %s' % (data, t.hex_T))
else:
print('Error I dont know how to handle tag %s in dol' % t.hex_T)
print('If you want to fill it with null value,', end=' ')
print('add a known_in_dol flag in TLVdict for that tag')
return None
return dol_data
def generate_otp(cid, atc, ac, iad, ipb, psn=None, debug=False):
# Expecting arguments as hex strings
if psn is not None:
hex_data = psn
else:
hex_data = ''
hex_data += cid + atc + ac + iad
if debug:
print('Data: ' + hex_data)
print('Filter:' + ipb)
# Right trim hex_data to same length as ipb:
hex_data = hex_data[:len(ipb)]
# From http://stackoverflow.com/questions/1054116\
# /printing-bit-representation-of-numbers-in-python
binary = lambda n: n > 0 and binary(n >> 1) + [int(n & 1)] or []
# Note that created binary lists are.
bin_data = binary(int("01" + hex_data, 16))[1:]
bin_ipb = binary(int("01" + ipb, 16))[1:]
# Left trim bin_data to same length as bin_ipb
bin_data = bin_data[len(bin_data) - len(bin_ipb):]
if debug:
print('Data: ' + ''.join([str(b) for b in bin_data]))
print('Filter:' + ''.join([str(b) for b in bin_ipb]))
otp = 0
debug_otp = ''
for i in range(len(bin_ipb)):
if bin_ipb[i]:
otp = (otp << 1) + bin_data[i]
debug_otp += str(bin_data[i])
else:
debug_otp += ' '
if debug:
print('OTP: ' + debug_otp)
return otp
def generate_otp_be(atc, ac, debug=False):
# Expecting arguments as hex strings
# AC_byte2 & 0x3 | AC_byte1 | ATC_byte0 | AC_byte0
# +report of unit to the left
# +truncation 8 digits
otp = (int(ac[-6:-2], 16) & 0x3FF) << 16
otp += int(atc[-2:], 16) << 8
otp += int(ac[-2:], 16)
otp += (otp % 10) * 10000000
otp %= 100000000
return otp
def mix_tds(ac, mdata, debug=False):
des = DES.new(key=ac.decode("ascii"), mode=DES.MODE_CBC, IV='\x00'*8)
data = 'F'.join([str(i) for i in mdata])
if len(data) % 2:
data += 'F'
# bit padding:
data += '80'
data += '00' * ((8 - ((len(data) / 2) % 8)) % 8)
if debug:
print('TDS: ' + data)
return des.encrypt(data.decode("ascii"))[-8:].encode("ascii")